Mixing
Why is it necessary to create non-parametric constructor for an object to be bound with Solr Response?
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I'm using solrj in my project and following this tutorial, I created an object class
public class Student {
@Field String id;
public Student(String studentId) {
this.id = studentId;
}
//setter and getter methods here
}
And used the following code to retrieve data from Solr and bind the response to Student object
final SolrClient client = getSolrClient();
final SolrQuery query = new SolrQuery("*:*");
query.addField("id");
final QueryResponse response = client.query("collection-name", query);
final List<Student> students = response.getBeans(Student.class);
I'm getting an error at last line. org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class Student
But, when I add public Student() { } constructor to Student class, It works fine. My question is, why didn't it work in the first case or why is it necessary to create a non-parametric constructor here?
java spring-boot data-binding solr solrj
asked Jan 3 at 13:28
tezztezz
83111
add a comment |
I'm using solrj in my project and following this tutorial, I created an object class
public class Student {
@Field String id;
public Student(String studentId) {
this.id = studentId;
}
//setter and getter methods here
}
And used the following code to retrieve data from Solr and bind the response to Student object
final SolrClient client = getSolrClient();
final SolrQuery query = new SolrQuery("*:*");
query.addField("id");
final QueryResponse response = client.query("collection-name", query);
final List<Student> students = response.getBeans(Student.class);
I'm getting an error at last line. org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class Student
But, when I add public Student() { } constructor to Student class, It works fine. My question is, why didn't it work in the first case or why is it necessary to create a non-parametric constructor here?
java spring-boot data-binding solr solrj
asked Jan 3 at 13:28
tezztezz
83111
How would SolrJ know what value to map to your constructor? Since it'll have to create the object before assigning values, it won't be able to do that if there's no way it can construct the object without additional information.
– MatsLindh
Apr 2 at 8:49
add a comment |
I'm using solrj in my project and following this tutorial, I created an object class
public class Student {
@Field String id;
public Student(String studentId) {
this.id = studentId;
}
//setter and getter methods here
}
And used the following code to retrieve data from Solr and bind the response to Student object
final SolrClient client = getSolrClient();
final SolrQuery query = new SolrQuery("*:*");
query.addField("id");
final QueryResponse response = client.query("collection-name", query);
final List<Student> students = response.getBeans(Student.class);
I'm getting an error at last line. org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class Student
But, when I add public Student() { } constructor to Student class, It works fine. My question is, why didn't it work in the first case or why is it necessary to create a non-parametric constructor here?
java spring-boot data-binding solr solrj
asked Jan 3 at 13:28
tezztezz
83111
I'm using solrj in my project and following this tutorial, I created an object class
public class Student {
@Field String id;
public Student(String studentId) {
this.id = studentId;
}
//setter and getter methods here
}
And used the following code to retrieve data from Solr and bind the response to Student object
final SolrClient client = getSolrClient();
final SolrQuery query = new SolrQuery("*:*");
query.addField("id");
final QueryResponse response = client.query("collection-name", query);
final List<Student> students = response.getBeans(Student.class);
I'm getting an error at last line. org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class Student
But, when I add public Student() { } constructor to Student class, It works fine. My question is, why didn't it work in the first case or why is it necessary to create a non-parametric constructor here?
java spring-boot data-binding solr solrj
java spring-boot data-binding solr solrj
asked Jan 3 at 13:28
tezztezz
83111
asked Jan 3 at 13:28
tezztezz
83111
edited Apr 2 at 5:29
tezz
asked Jan 3 at 13:28
tezztezz
83111
asked Jan 3 at 13:28
tezztezz
83111
asked Jan 3 at 13:28
tezztezz
83111
83111
How would SolrJ know what value to map to your constructor? Since it'll have to create the object before assigning values, it won't be able to do that if there's no way it can construct the object without additional information.
– MatsLindh
Apr 2 at 8:49
add a comment |
How would SolrJ know what value to map to your constructor? Since it'll have to create the object before assigning values, it won't be able to do that if there's no way it can construct the object without additional information.
– MatsLindh
Apr 2 at 8:49
How would SolrJ know what value to map to your constructor? Since it'll have to create the object before assigning values, it won't be able to do that if there's no way it can construct the object without additional information.
– MatsLindh
Apr 2 at 8:49
How would SolrJ know what value to map to your constructor? Since it'll have to create the object before assigning values, it won't be able to do that if there's no way it can construct the object without additional information.
– MatsLindh
Apr 2 at 8:49
add a comment |
1 Answer
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In all solrj ref guides, there is an example and it has empty constructor, but there is no description for that. I think the api calls empty constructor before fetch data and fills fields one by one.
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
add a comment |
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1 Answer
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1 Answer
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active
oldest
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In all solrj ref guides, there is an example and it has empty constructor, but there is no description for that. I think the api calls empty constructor before fetch data and fills fields one by one.
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
add a comment |
In all solrj ref guides, there is an example and it has empty constructor, but there is no description for that. I think the api calls empty constructor before fetch data and fills fields one by one.
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
add a comment |
In all solrj ref guides, there is an example and it has empty constructor, but there is no description for that. I think the api calls empty constructor before fetch data and fills fields one by one.
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
In all solrj ref guides, there is an example and it has empty constructor, but there is no description for that. I think the api calls empty constructor before fetch data and fills fields one by one.
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
answered Jan 3 at 13:49
C. SoyluC. Soylu
343
343
add a comment |
add a comment |
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How would SolrJ know what value to map to your constructor? Since it'll have to create the object before assigning values, it won't be able to do that if there's no way it can construct the object without additional information.
– MatsLindh
Apr 2 at 8:49